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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.

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/*
 * Copyright 2011 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.impl.lazy;

import java.util.Collection;
import java.util.Iterator;

import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.impl.UnmodifiableIteratorAdapter;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.LazyIterate;
import net.jcip.annotations.Immutable;

/**
 * A LazyIterableAdapter wraps any iterable with the LazyIterable interface.
 */
@Immutable
public class LazyIterableAdapter
        extends AbstractLazyIterable
{
    private final Iterable adapted;

    public LazyIterableAdapter(Iterable newAdapted)
    {
        this.adapted = newAdapted;
    }

    public void forEach(Procedure procedure)
    {
        Iterate.forEach(this.adapted, procedure);
    }

    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
        Iterate.forEachWithIndex(this.adapted, objectIntProcedure);
    }

    public  void forEachWith(Procedure2 procedure, P parameter)
    {
        Iterate.forEachWith(this.adapted, procedure, parameter);
    }

    public Iterator iterator()
    {
        return new UnmodifiableIteratorAdapter(this.adapted.iterator());
    }

    @Override
    public > R into(R target)
    {
        Iterate.addAllIterable(this.adapted, target);
        return target;
    }

    @Override
    public LazyIterable select(Predicate predicate)
    {
        return LazyIterate.select(this.adapted, predicate);
    }

    @Override
    public LazyIterable reject(Predicate predicate)
    {
        return LazyIterate.reject(this.adapted, predicate);
    }

    @Override
    public  LazyIterable collect(Function function)
    {
        return LazyIterate.collect(this.adapted, function);
    }

    @Override
    public  LazyIterable flatCollect(Function> function)
    {
        return LazyIterate.flatCollect(this.adapted, function);
    }

    @Override
    public  LazyIterable collectIf(Predicate predicate, Function function)
    {
        return LazyIterate.collectIf(this.adapted, predicate, function);
    }

    @Override
    public LazyIterable take(int count)
    {
        return LazyIterate.take(this.adapted, count);
    }

    @Override
    public LazyIterable drop(int count)
    {
        return LazyIterate.drop(this.adapted, count);
    }

    @Override
    public LazyIterable distinct()
    {
        return LazyIterate.distinct(this.adapted);
    }

    @Override
    public Object[] toArray()
    {
        return Iterate.toArray(this.adapted);
    }

    @Override
    public int size()
    {
        return Iterate.sizeOf(this.adapted);
    }
}